Screen



R. H. HAWLEY,.

SCREEN.

APPLICATION FILED AUG.26, 1921.

Patented Dec, 12, 1922.

A TTOR/l/EVS Patented Dec. 12, 1922.,

barren stares ROBERT HOWARD HAWLEY, 0F MAGNA, UTAH.

SCREEN.

Application filed August 26, 1921. Serial No. 495.589.

To all whom if may concern.

Be it known that 1, ROBERT H. HAWLEY, a citizen of the United States, and'a resident of Magna, in the county of Salt Lake and State of Utah, have invented a new and Improved Screen, ofwhich the following is a full, clear, and exact description.

his invention has relation to a screen for the grading of materials and refers more particularly to that type of screen employed in separators and actuated by jarring or vibrating mechanisms to cause the material to be screened to readily pass therethrough.

The invention contemplates more speclfically a means for suspending the screen cloth within a frame to admit of its removal therefrom when unfit for use and its replacement by a new screen.

The invention further contemplates a sus pension means which affords a simple and efiicient means for obtaining the desired tension on the screen cloth in such a manner as to minimize the tearingof the same.

The invention further contemplates in a screen and frame therefor a suspension means which is extremely simple in its construction, inexpensive to manufacture, and which is thoroughly reliable and highly efiicient in its purpose.

lVith the above recited and other objects in View, the invention resides in the novel construction, set forth in the following specification, particularly pointed out in the appended claims and illustrated in the accompanying drawings, it being understood that theright is reserved to embodiments other than those actually illustrated herein to the full extent indicated by the general meaning of the terms in which the claims are expressed and by variations in the phraseology of the same.

In the drawings- Figure 1 is a plan view of a screen and frame illustrating the suspension means for associating the same, with the guard member or shield removed.

Fig. 2 is an enlarged transverse sectional view.

Referring to the drawings by characters of reference, 10 designates a screen frame having parallel side and end rails 11 and 12 in which the screen cloth 13 is suspended by the suspension means to be hereinafter fully described. In order to render the screen cloth 13 particularly applicable to the suspension means the opposite longitudinal edges of the same have casted thereon a lead strip 14 which when the screen cloth is worn out may be recovered and recast on other screen cloth.

The suspension means includes a plurality of identically constructed bolts 15 having threaded outer extremities 16 and bifurcated inner extremities 17, the shanks of which extend through spaced transverse openings 18 in the side rails 11 of the frame. Bearing washers 19 are inserted over the outwardly projecting extremities of the bolt shank 15 and are designed to rest against the outer side edges of the side rail.

knife edge member 20 having a central aperture 21 is inserted over the outer extremity of the bolt with the pointed extremity disposed inwardly for engagement with the bearing washers 19. Securing nuts 22 are. threaded on the extremity 16 and are designed to engage the knife edge members 20. i The opposite longitudinal edges of the screen cloth are arranged between a pair of strips of material 23 arranged on opposite sides of the screen and contiguous to the lead strips 14L. The screen cloth and strips 23 are received between the furcations of the bifurcated extremity of the bolt and held in place by the retaining bolts 24 passed through aligned apertures in the furcations of the extremity 17, the strips 23 and the screen fabric. By this arrangement it will be obvious that the screen will be suspended within the frame from the opposite side rails 11 thereof on the knife edge members, the nuts 22 affording means for varying the tension on the screen cloth or fabric. The cast on lead strips 14 will operate to prevent tearing of the screen cloth by the retaining bolts 24 when tension is applied to the screen. In order to prevent the material being screened or sized from escaping over the sides of the screen, a suitable shield or guard member 25 is provided, the same being of arcuate formation and having an attaching flange 26 secured by fastening screws 27 to the frame to cause the arcuate portion thereof to project downwardly into substantial contact with the screen cloth. By this arrangement-it will be observed that the screen cloth or fabric will be effectively suspended and tensioned within the frame in such a manner as to permit of its removal and replacement when unfit for use. By providing the edges of the cloth fabric with cast on lead strips 14, the screen fabricis in effect equipped with shouldered edges which engage and coact with the clamping strips 23 to prevent slippage and consequent tearing of the screen cloth by the retaining bolts 24, which according to the present arrangement serve merely to clamp the furcations of the extremity 17 of the bolt against the strips 23. From this arrangement it will be seenthat the screen fabric is supported and suspended by means of the knife edge members which engage and means for suspending said screen fabric within the.frame from the side rails thereof, comprising a pair of clamping strips at the opposite side edges thereof disposed in abutting relation to the cast-on strips, tension bolts extending through the apertures in the side rails of the frame having bifurcated inner extremities between which the clamping strips are arranged, securing bolts assed through the bifurcated extremities of the tension bolts and through the clamping strips and screen fabric, washers arranged over the outer ends of the bolts, knife edged sleeves arranged over said bolts and nuts threaded'on the outer ends of said bolts for forcing the knife edges of the sleeves into engagement with the washers, the washers into engagement with the outer sides of the rails, and for adjusting the tension on the fabric.

2. In a screen of the character described, a frame, a screen fabric, and means for suspending the screen fabric from opposite sides of the frame whereby variation in the tension of the fabric may be obtained, said means comprising a plurality of apertured portions in the .side rails of the frame, clamping strips between which the opposite edges of the screen fabric is secured, bolts attached at their inner ends to the clamping strips and extending through the apertured portions of the frame, washers arranged over the outer ends of the bolts, knife edged sleeves arranged over the outer ends of said bolts and interengageable with the washers,

and nuts threaded on the outer end of said 'bolts for forcing the knife edge of the sleeves into engagement with the washers. ROBERT HOWARD HAWLEY. 

